The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 2004
Filed:
Nov. 22, 2000
Ingrid Jozef Maria Snijkers-Hendrickx, Eindhoven, NL;
Henricus Albertus Maria Van Hal, Eindhoven, NL;
Volker Dirk Hildenbrand, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The low-pressure mercury vapor discharge lamp has a filling of mercury and an inert gas, and the glass discharge vessel ( ) is provided on the inner surface ( ) of the wall ( ) with a film ( ) of trifluoride and/or oxyfluoride of at least one element, which is trivalent at most, which is selected from lanthanides, lanthanum, scandium and yttrium. The film ( ) counteracts transport of mercury from the discharge vessel to the wall ( ) and of alkali from the wall ( ) to the discharge vessel. In this manner, a decrease of the lamp's efficiency and of the service life are counteracted.